John Wallop, 1st Earl of Portsmouth (15 April 1690 – 22 November 1762), of Hurstbourne Park, near Whitchurch and Farleigh Wallop, Hampshire, known as John Wallop, 1st Viscount Lymington from 1720 to 1743, was a British politician who sat in the House of Commons from 1715 to 1720, when he vacated his seat on being raised to the peerage as Viscount Lymington and Baron Wallop.